ctags: Sourcefile indexer1

Exuberant Ctags is a multilanguage reimplementation of the much-underused
ctags(1) program and is intended to be the mother of all ctags programs. It
generates indexes of source code definitions which are used by a number of
editors and tools. The motivation which drove the development of Exuberant
Ctags was the need for a ctags program which supported generation of tags
for all possible C language constructs (which no other ctags offers), and
because most were easily fooled by a number of preprocessor contructs.